annul (v.) Look up annul at Dictionary.com
late 14c., "invalidate, make void, nullify;" from Anglo-French and Old French anuler "cancel, wipe out" (13c.) or directly from Late Latin annullare "to make to nothing," from Latin ad "to" (see ad-) + nullum, neuter of nullus "nothing, none," from PIE root *ne- "not." Related: Annulled; annulling.